GB509733A - Improvements in or relating to coil filament manufacture - Google Patents

Abstract

509,733. Coiling. HOFMANN & CO., A. Oct. 12, 1938, No. 29570. Convention date, Oct. 15, 1937. [Class 83 (iv)] Lamp filaments are made from a continuous wire by clamping the end of the wire to a mandrel, rotating the mandrel to effect coiling, forming a straight leg on the coil, severing and stripping the coil from the mandrel. The mandrel A is carried on a wire gripper C rotated through a clutch g<6> from an electromotor. A cam shaft beneath the mandrel is driven through gearing 41 and carries cams for actuating the elements of the machine. The gripper C is actuated by axial movement of a rod C<5> by a cam actuated lever C'. The clutch is operated by a member M which is locked against movement until a spring is stressed and it is then released to effect quick operation of the clutch and to insert a locking dog j to stop the mandrel in a predetermined position. A wire guide B receives-wire from a spool and guides it along the mandrel. The guide is mounted on a support N moved transversely to the mandrel on a carrier P which has an arcuate movement effected by cranks from the cam shaft. The carrier P is mounted on a carriage Q moved axially of the mandrel. Pivoted shears E shear the wire and a stripper is raised and swung by cams to strip and remove the completed coil. Operation. The wire guide B moves to insert the end of the wire into the gripper C which is then closed by the lever C<8>. The clutch g‹ is then operated to rotate the mandrel and effect coiling. The wire guide B is moved by the carriage Q to determine the pitch of the helix. The end of the mandrel is supported by a rest D which moves with the guide. At the end of the coiling the mandrel is stopped in a position determined by a stop and the guide B is reracted by movement of the support N over the wire to form a double leg on the end of the helix The guide is then swung about 90 degrees by the arcuate movement of the carrier P to bend the leg of the wire, about the mandrel rest D, into alignment with the helix. The shear E is then actuated to sever the leg midway between its ends. The mandrel rest is then lowered and the guide retracted. The stripper is swung to a position beneath the coil and is raised and retracted to strip the coil from the mandrel when the gripper is opened.